Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

Answers (1)
R Rakhi

The rules for writing of distribution of electrons in various shells for the first eighteen elements are:

         (i) The maximum number of electrons present in a shell is formula = 2n2

              n = orbit number i.e., 1, 2, 3

              Maximum number of electrons in different shells are:

              K shell n = 1 2n2 ⇒ 2(1)2 = 2

              L shell n = 2 2n2 ⇒ 2(2)2 = 8

              M shell n = 3 2n2 ⇒ 2(3)2 = 18

              N shell n = 4 2n2 ⇒ 2(4)2 = 32

         (ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.

         (iii) Electrons are not accommodated in a given shell unless the inner shells are filled. (Shells are filled step-wise).

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